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One big reason to be able to use faster shutter speeds with flash is to be able to balance ambient light with flash output. Synching any electronic flash to properly expose an entire sheet of film at any speed becomes quite a project since the slit sizes in the fp curtain varies with the selected speed. There is not a constant slit size or curtain travel speed. So how would you accomplish this with a speed graphic?
I think the only way you could get a modern strobe with a speed graphics:
You would need to get a circuit to tell the strobe trigger its in HSS and what the shutter speed is. This will tell the strobe to pulse the light out of the strobe.
I personally don't ever use HSS in my work flow, because I want the full power of my strobes. Using the Lens prong or using a PC sync cable, I get to use all the shutter speeds, B-1/400 or 1/500. On my digital camera its 1/200.
If you can't get to HSS, you can use an ND filter.
I use a Profoto B10+ , B2 Godox ad200s, and Godox AD400pro. I use the Godox trigger and My Profoto Air Remote didn't have a sync port, so I bought a trigger on ebay to use with my profoto strobes.
More importantly are they reliable.. i've tested my focal plane shutter flash and it doesn't fire about one out of 6 times, film is too expensive these days to live with that.
If I'm shooting a flash with my fp shutter, I use T, and just try to be quick about the operations (open shutter, flash, close shutter). If I was going to do a lot of flash photography with the FP shutter I'd create something to automate this process.
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